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우주 물질 연구소(국문 홈페이지)

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  • Search for Z ′ → μ + μ − in the L μ − L τ gauge-symmetric model at Belle

    • 등록일
      2022.07.08
    • 조회수
      169

AUTHORS & AFFILIATIONS

ABSTRACT

We search for a new gauge boson Z that couples only to heavy leptons and their corresponding neutrinos in the process e+eZ(μ+μ)μ+μ, using a 643fb1 data sample collected by the Belle experiment at or near the Υ(1S,2S,3S,4S,5S) resonances at the KEKB collider. While previous searches for Z performed a data-based estimation of the initial state radiation effect, our search for the Z is the first to include effects due to initial state radiation in the signal simulated samples that were used in estimating the detection efficiency. No signal is observed in the Z mass range of 0.21210GeV/c2, and we set an upper limit on the coupling strength, g, constraining the possible Z contribution to the anomalous magnetic dipole moment of the muon.

DOI:https://doi.org/10.1103/PhysRevD.106.012003

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